The Fuller A-8956 Synchronizer is an OEM Eaton Fuller transmission component designed to provide smooth, reliable gear engagement in heavy-duty Fuller RT/RTX/RTLO series manual transmissions. It functions by equalizing shaft speeds before engagement, reducing gear clash, extending gear life, and improving overall shift quality. Also listed as A-6608, A-6608B, A6608, A6608-SP, FUL A6608, A8956, A-8956A6137, S-13449


